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Two pin fins are identical, except that the diameter of one of them is twice the diameter of the other. For which fin is the (a) fin effectiveness and (b) fin efficiency higher? Explain.
Fin with large diameter has more efficiency because more heat can reach the fin tip of a large diameter fin when compared to that of a fin with a small diameter.
Fin with a smaller diameter is of higher effectiveness. This is because, for small diameter fins, the surface area available per unit volume is relatively more extensive than that of the fins of large diameter.